How is Heat Transfer Calculated in Ice Melting Problems?

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Homework Help Overview

The discussion revolves around a heat transfer problem involving the melting of ice. The original poster presents a scenario where 80.0g of ice at -15 degrees Celsius is subjected to 19.2 kJ of heat, seeking to determine the final temperature of the ice and the remaining mass after heat application.

Discussion Character

  • Exploratory, Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants explore the effects of adding heat to ice, questioning the implications of the total heat energy provided (19.2 kJ) and its role in raising the temperature and melting the ice. There is confusion regarding how to account for the heat energy in calculations.

Discussion Status

The discussion is active, with participants offering insights into the process of heat transfer and phase changes. Some participants clarify that heat addition raises the temperature until the melting point is reached, while others express confusion about how to apply the total heat energy in their calculations. There is no explicit consensus on the final outcomes or calculations yet.

Contextual Notes

Participants are navigating the complexities of heat transfer calculations and the melting process, with some uncertainty about the amount of heat required to completely melt the ice. The original poster's question indicates a need for further exploration of these concepts.

sdevgon
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1. An amount of ice of mass 80.0g is in a freezer at a temp of -15 degree Celsius. The ice is removed from the freezer, and a total of 19.2KJ of heat is added to the ice. Determine the final temperature of the ice and the mass of ice (if any) which remains after the heat is supplied.



2. Ans is 0 degree Celsius, 30.0g of ice remains



I don't know know how to get that answer. Please help !
Thanks
 
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What do you think happens when you add heat to ice at -15 oC? What happens to any solid when you add heat to it?
 
adding heat to ice will cause it to melt. But what confused me is 19.2KJ of heat energy. Because i keep taking 19.2KJ of heat energy in consideration when calculating the final temperature.
 
sdevgon said:
adding heat to ice will cause it to melt.
Not necessarily. Adding heat to a solid raises its temperature. It will start melting only if it reaches its melting temperature. So the 19.2 kJ of heat energy do two things: (a) first they raise the temperature of the ice from -15 oC to 0 oC and (b) whatever heat is left over melts as much ice as it can.
But what confused me is 19.2KJ of heat energy. Because i keep taking 19.2KJ of heat energy in consideration when calculating the final temperature.
Why did that confuse you? Of course you should take it in consideration. The final temperature will not rise unless all the ice melts. Evidently, here you don't have enough heat to melt all the ice.
 

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